In reading the philosophy of St. Thomas Acquinas it is clear that he brings divinity into every one of his reasonings. While he does seem to share some of the beliefs of Aristotle, he goes one step further and explains each of his findings as it relates to God. A poignant quote is, "along with natural happiness, there is a supernatural happiness of coming to 'se God as he is.'" St. Thomas Acquinas sees god in every discussion he makes.
St. Thomas Aquinas talks bout good, but in different terms that St. Augustine. St. Augustine believes that evil is the absence of good. St. Thomas Acquinas said every agent acts for a good. However, if there is evil - the absence of good ? then not every agent is good. St. Thomas Acquinas said that all things are directed to one good as their last end. St. Augustine said that an evil will fails to choose good. Therefore, it seems that free will can be good or bad. The subjects of good, evil and free will really do require a lot of thought!